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Directed Reading A
Section: The Theory of Plate Tectonics
1. The theory that Earth is divided into plates that move around is
.
TECTONIC PLATE BOUNDARIES
______ 2. The place where tectonic plates touch is known as the
a. continental plate.
c. magma zone.
b. tectonic boundary.
d. tectonic ridge.
______ 3. Which of the following is NOT a type of tectonic plate boundary?
a. convergent boundary
c. divergent boundary
b. fault-block boundary
d. transform boundary
______ 4. The three ways that tectonic plates can move relative to each other are
a. collide, separate, and slide.
c. drift, separate, and slide.
b. collide, fuse, and slide.
d. collide, fuse, and drift.
5. When two plates with continental crust collide, what happens to the
continental crust?
Match the correct definition with the correct term. Write the letter in the space
provided.
______ 6. boundary formed when tectonic
plates collide
______ 7. boundary formed when tectonic
plates separate
a. transform boundary
b. convergent boundary
c. divergent boundary
______ 8. boundary formed when tectonic
plates slide past horizontally
9. Which type of boundary produces strike-slip faults?
10. Which type of boundary produces earthquakes?
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Directed Reading A continued
POSSIBLE CAUSES OF TECTONIC PLATE MOTION
______11. When rock is heated, it becomes less dense and tends to
a. rise.
b. sink.
c. move sideways.
d. erupt.
______12. When rock cools, it becomes more dense and tends to
a. rise to the surface.
b. sink below the surface.
c. move sideways.
d. push against the surface.
13. Density changes in the asthenosphere are caused by the flow of
energy from deep within the Earth.
Match the correct definition with the correct term. Write the letter in the space
provided.
______14. plate motion due to higher densities
a. ridge push
b. convection
______15. plate motion due to gravity
c. slab pull
______16. plate motion due to the heating and
cooling of rocks
TRACKING TECTONIC PLATE MOTION
______ 17. How fast do tectonic plates move?
a. kilometers per year
b. meters per year
c. meters per month
d. centimeters per year
______18. What do scientists use to measure the rate of tectonic plate
movement?
a. clinometers
b. the global positioning system
c. densitometers
d. seismographs
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Section Review
The Theory of Plate Tectonics
USING KEY TERMS
1. In your own words, write a definition for the term plate tectonics.
UNDERSTANDING KEY IDEAS
______ 2. The speed a tectonic plate moves per year is best measured in
a. kilometers per year.
b. centimeters per year.
c. meters per year.
d. millimeters per year.
3. Briefly describe three possible driving forces of tectonic plate movement.
4. Explain how scientists use GPS to measure the rate of tectonic plate
movement.
MATH SKILLS
5. If an orbiting satellite has a diameter of 60 cm, what is the total surface area
of the satellite? (Hint: surface area = 4r 2) Show your work below.
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Section Review continued
CRITICAL THINKING
6. Identifying Relationships When convection takes place in the mantle, why
does cool rock material sink and warm rock material rise?
7. Analyzing Processes Why does oceanic crust sink beneath continental crust
at convergent boundaries?
Copyright © by Holt, Rinehart and Winston. All rights reserved.
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Plate Tectonics